How can electrolyte carbonate solvents (e.g, EC, DMC etc) of a polymer Li-ion battery be trapped as they are highly volatile upon opening a cell?

I am new to the lithium-ion battery field and working with high-nickel cathodes, specifically NMC. I am encountering issues during slurry preparation: after stirring, the slurry solidifies.

The slurry composition is 80:10:10 (NMC: PVDF dissolved in NMP: carbon black), stirred for 40 minutes with alternating vacuum and non-vacuum steps. I expected a viscous liquid, but it has consistently turned solid recently.

Could this issue be related to the reagents, the NMC, or the mixing process? Any insights would be greatly appreciated.

Thank you!

Do we still base the specific capacitance off the active material on the electrode? In dual ion batteries the source of energy is in electrolyte and not necessarily found in the electrode. Or have people been calculating it based off of the active material in the liquid electrolytes?

Just wondering which method others have been using for this calculation.

Before starting the battery Charge - Discharge cycle I'm keeping the battery in rest ~24h (in OCV mode, no Charge/discharge only the measurement of voltage).

I'm getting a increase- decrease in voltage some times it is periodic in nature. Can any one have explanation to the Obs.

Electrolyte in use [2M LiTFSI in DME +0.35M LiNO3]

I am currently working on NCM811 half cell and its typical working voltage in a lithium ion coin cell setup is 3-4.3V. After assembling the coin cell, the OCP of the coin cells typically range between 2.2-2.8V. Is it necessary for the cells to have OCP in the range of typical working window? If yes, what could be the possible scenarios that would cause the coin cells to have lower OCP?

Thank you.

I make polycrystalline diamond with tape casting followed by HPHT sintering. When i sintered the samples up till May, the sintering was good. When i sintered the samples in June and July at the same conditions, the sintering was not good. I used the same slurry making conditions, tape casting conditions, debinding conditions, heat treatment conditions, and sintering conditions.

The only changed parameter i can think of may be humidity, as humidity is very high in June, July and August in Korea.

What tests should i perform and at what stages? How to overcome this issue?

Thank you.

I need help with the formation of the cathode slurry for lithium-ion batteries using NMC material. When depositing it onto aluminum foil, it becomes brittle. I am using a ratio of 80:10:10 (NMC:PVDF:Carbon Super P) in NMP as the solvent.

Any suggestions on how to improve this?

I have attached an image of the unsuccessful result.

I appreciate your support.

Kind regards.

I understand adding NaOH or Acid directly for adjusting pH of protein solution is not recommended. But we see oxidation and deamidation of proteins after adjusting. So should I consider the oxidation and deamidation is due to direct pH adjustment?

referencing to a paper from Jeff Dahn's group in 2011 ( 10.1149/1.3515072 ),

to those that this post reaches and work in LIB's, is it necessary to compress/calendar cathodes that are at 90% and below?

I've been doing an assignment recently and the literature mentions a reductive amination reaction involving sodium cyanoborohydride, from what I've found, the reason why sodium cyanoborohydride is reductive is because of the migration of the hydrogen negative ions, so does boron have a change in valence during this process? My teacher says that boron should have a change in valence, but I can't figure out why this is, and what it turns into at the end of the reaction. Can anyone help me with this?